Indents in the pavement are all that remain from a grisly death machine in Paris.

This massive redwood tree has a hole in the base big enough to drive through.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This free, take-a-book shop seems like a trick but isn't.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

The final resting place of a space program monolith.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

London's smallest police station is barely the size of a phone booth.

The eccentric mansion of one the most popular horror authors of modern times.

Eighty million natural history specimens call this gargantuan museum home.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

This glamorous old building is said to have inspired the Tower of Terror.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

A storybook European village in Berkeley.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Magical-looking cottages that inspired one of the most famous animated films ever.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Ride the subways of yesteryear.

A mysterious artist-run cabinet of curiosities and library.